# SIIL Student vs ACT Prep

The clearest difference is in-app purchases: SIIL Student at none against ACT Prep's 10. SIIL Student also leads on update cadence (every 3 weeks vs every 7 months) and iOS requirement (13.0 vs 15.1). ACT Prep's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. ACT Prep sells 10 in-app purchases, starting at $4.99 per 7 days. SIIL Student asks for nothing beyond the download.

SIIL Student ships an update every 3 weeks, ACT Prep every 7 months. The most recent releases landed on October 18, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SIIL Student | ACT Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Size | 70 MB | 53 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Swiss international institute Lausanne - SIIL Sarl](https://appshunter.io/developer/1725789459) | [YAUHEN BAHDANOVICH](https://appshunter.io/developer/1711932790) |

## What reviewers say

### SIIL Student

[App page](https://appshunter.io/ios/app/siil-student/id6476093571)

**Features:** macOS Compatibility

**In-app purchases:** none


### ACT Prep

[App page](https://appshunter.io/ios/app/act-prep-practice-test-2026/id6523427865)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ACT Prep Weekly Full Access | $4.99 | per 7 days |
| ACT Weekly Full Access | $14.99 | per month |
| ACT Prep Monthly Full Access | $14.99 | per month |
| ACT Exam Monthly Full Access | $34.99 | per month |
| ACT Exam Quarterly Full Access | $55.99 | per 3 months |
| ACT Exam Quarterly Full Access | $59.99 | per 3 months |
| ACT Exam Semiannual Access | $75.99 | per 6 months |
| ACT Exam Semiannual Access | $79.99 | per 6 months |
| ACT Exam Annual Full Access | $109.99 | per year |
| ACT Exam Annual Full Access | $119.99 | per year |


## Frequently asked questions

### Is SIIL Student free?

SIIL Student is free to download, with no in-app purchases.

### Is ACT Prep free?

ACT Prep is free to download, with in-app purchases available.

### Do SIIL Student or ACT Prep have ads?

SIIL Student shows ads; ACT Prep does not.

### Which is updated more often, SIIL Student or ACT Prep?

SIIL Student ships an update every 3 weeks, and ACT Prep every 7 months. Most recently, SIIL Student was updated on October 18, 2026 and ACT Prep on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*